Machine tool



K. RAUCH MACHINE TOOL April 2, 1946.

Filed June 21, 1943 3 Sheets-Sheet l ATTORNEY.

Aptil 2, 1946. RAUCH 2,397,503

MACHINE TOOL Fi] ed June 21, 1943 3 Sheets-Sheet 2 IN VEN TOR.

K; RAUCH MACHINE TOOL April 2, 1946.

Filed June 21, 1943 3 Sheets-Sheet 5 I INVENTOR.

flan/ M Patented Apr. 2, 1946 Shefli'ld Corporation, Dayton;

ration f lohio Ohio, a corpos- Application June. 21, 1943, Serial'No; 491577" 23 (El-aims;

This invention, relates to. grinding, apparatus, and more particularly; to trimming or truingdevices for grinding; wheels,

Qnee object of the invention; is the; provision,- in: a grinding annaratus, ofuw-heel twins 7 mechanismi including: apair of. wheel trimmers a11- ranged for: movement. atza desired angular rela, tionship, and. automatically} operated by: simple. means including: angularly: movable. arms and slide devicesfproviding for a combinationiof dii ferenti rectilinear motions: which produce the desired-iresulting movementscof the -wheel ztrimmers;

,Another'obiect of the invention istheprovi sion of wheel trimming mechanism arrangedin; a--,ca.rrierwhich is-suppprted in. a grinding; wheel supp ort-,; the; grinding; wheel" support being: at rangedionadjustment.about an axis -perpendicular to; the grinding wheeli axis in accordance with: the: helix angle; of i a, thread; to be ground; and; the carrier having; a; plurality; of, portions one-of,- which is arranged for-both; axiaLand-rotational movement; in the; grinding; wheel supportand the-. other, of. whichxisa adiustably connected; toz-the zfirst portionrand hassaxialimovement only,

Another. object-is thepmvision: oiawheelitrimpr ming mechanism: including a; carrier having, a; portion whichi-isaxialhrmovable inra passa errinj the: grinding wheel; sunnort; the carrier; having; an adjustableaconnection with; anzazbutmentpore tion that1 -is., detachablm carried. byithes foot: pore tion of afixed standard; and smarrangedmhatrthez aliutmentpontion: can he removed; as .aiunitwith the carrier without disturbing operating con nectionscbetweemthatiabutmentrportion and other portionsxofzthemarrien Another; object; is; the, provision) of av wheel: trimming;- device-includingza carrier which is m tatahl'y' and; axially movable: im an passage in) a. grinding. wheeL support and; so. arranged-i that: bothathe carrier: and thegrinding wheelisupport are independently adjustable ahout an axis perpendicularrto the grinding-wheellaxis; the car-- rier-inoludingran end: portion that-is carried for rolling: movement! on: a standard fixedi on the framezthat. carriesthegrinding; wheel" support;

Another object is the provision of a wheel'- trimming-rdevicezhavmg alpair of relatively movable: wheel; trimmer holders and: mechanism for automatically: operating; said: holders toadvance theholdersztowands the grinding wheel and for movingrthe holders in: opposite directionset'o pro duoe the desired angles on the'facesof the grind ing wheel; eachholder carrying a diamond mount whichis= readily separable from the liold'erain a dire coonsutstantiallizv tange ially, or theerlnding wheellwithout removing the. holders ogerating mechanism orthe grindineWh l:

Other objects andiadvanta esdf. th invention. will'iber anp arent -from the following. description; the appended? claims, and the r accompanying, drawings? inwhich:

Fig; 1, is altop: plan view. of, attention Oil a grinding machine embodying the present. invene tion; 7

Fig. 2,is.a.,vertica1,.section,onithelineclrl of. Big. 1;

Fig, 3.. is a; horizontal. sectionronthe, line. 31-3. oitFig zg.

Fig. 4 is: an end View 015,-. the.diamondholdensv looking? in the; direction of. the arrow- 4-. shown; in Fliehiit Fig 5 is; an, end view of thev wheelttrimming a aratus-looking in thedirection- 01' the arrowz thin Eig Z;

Fig 6. isiaqvertical.seotionomthezline li -61' oi; Fi

Eightiis. aiseetionzon the linear-840E538; 3i;

Brig; 9.;isa diagrammatic staminezofithetbfllm mechanism: hmoperating; the: trimmer: holders: and:

Fig. 10 is a diagrammaticgshowine;ofttheemoe tions; impartedtotheztrimmersze Referring more; particularly to. the: in: which a:. preferred: embodiment; oi. the; invene tionzhas. been; illustrated". in: association with; at. thread; grindinggma-chine, I llzgenerallyl designates; the mainzmachine-hase having suitable worls'supeporting: and turning devices: and? suitable means of? any desired character for traversing-' the Work axiallywithlrespect -toa rotatablegrinding wheeli i so that the grinding wheel will'grinda threadof t-he desired pitch and angle-on theworkpiew The gri'nding wheel l l is rotatablymounted in-agrinding whee-l support [2 having anarbonsupe' porting portion in, which the grinding wheel arnor is rotatably carried,- this arbor supp rtingportion projecting from abody 'portion [3: I This body-portion 13- constitutes a barrel like mem Ioerwhich is rotat'ably adjustable in a: stationary bearing ringforming partof the wheel frame Y M which is mounted fOrrectilinear -mcv e=- ment on the main base to-movethe wheel towards andfronr thework: The rotatable mounting of thebarrel" |-3-pe rmits:the' whole grinding wheeli support tc be rotatably tadjusted; about ania gisj extendingperpendicularly to the grinding; wheel: axisand perpendicularly tothe work'dXiSsqthat the grinding wheel can be presented. to the work while rotating in a plane whiohis properly inclined to the work axis, in accordance with the helix angle of the thread to be produced. Ad-

justment of the barrel [3 is efiected by rotating a hand wheel l5which operates a worm I5 engaging the teeth of a worm wheel l1 provided :on the barrel l3, worm l6 being arranged on a worm shaft l8 which is rotatably carried in brackets provided on the frame l4. Any position of adjustment of the barrel I3 is securely maintained by tightening bolts l9 which secure end plate 26 tightly against the frame [4 which is fixed against rotation.

The barrel i3 is provided with a'passage 22 extending perpendicularly of the work axis and of the grinding wheel axis, passage 22 having a finished cylindrical slide surface 23 of considerable diameter, slidably supporting a carrier 24.

The carrier 24 forms the support or carrying means for wheel truing mechanism and the motor for operating that mechanism, so that the wheel truing devices, which are preferably truing diamonds, are automatically moved at the proper angle of divergence along adjacent surfaces of ,;the grinding wheel. The'truing diamonds, shown 7 at 25 and 25, are arranged in holders 2! and 28 respectively. The motor which operates these housing portion, these bolts threading into the housing portion and extending through arcuate slots 33 in the end wall so that the end wall,

' which does-not have a rotatable adjustment, can

permit: relative rotation of the housing portion in order to compensate as required for any inaccuracies-produced bythe' inclination of the grinding wheelin accordance with the helix angle of the thread to be ground. V

The entire carrier including the end wall 3| is bodily movable towards the grinding wheel axis, .andthe housing portion of the carrier also has the rotatable adjustment just 'mentioned,

bothflmovements of the housing portion causing relative sliding movement of its forward end on the grindingwheel support iii. The wheel'trim-.

mer holders 2'! and 28 move bodily in the carrier in a. common planeand in diverging directions on a pair of parallel guide bars 35, 35" which are themselves movable in the carrier towards and from the grinding .wheel as will be more fully described. Thus the trimmers or diamonds, when the bars 35, 35' are horizontal, move in a horizontal plane through the axis of the grinding wheel and trim the grinding wheel diametrically opposite the zone where the grinding takes place spherical or cylindrical rollers for rolling movement on a standard 31 which is fixed to or forms a part of the frame l4. Standard 31 is of generally U shape, having a foot portion 38 and upwardly extending legs 39, the upper side of the standard thus having a deep recess 40 past which the entire carrier can be moved. The legs 39 carry tracks 4| the upper surfaces of which are parallel to the axis of the. carrier, these tracks being arranged outwardly of the confines of the passage 22. reaches out laterally'as shown in Fig. 5 and is provided with rollers 12 operating along the tracks 4!. The rear end of the carrier is thus mounted for'rolling movement atpoints widely spaced from theaxis' of the carrier, preventing any rotational movement of the end wall of the carrier. Since the end wall of the carrier is held securely to the housing portion of the carrier the 20' latter is movable along the passage in the grind ing wheel support, without rotating.

The standard 51, near the upper ends of its leg portions, is provided with an abutment portion or bar 43 which normally extends across the end of the carrier and, which is normally secured firmly to the legs of the standard by means of threaded screws 44 pivoted at 45 to the legs of the standard and extending through slots 46 in the abutment bar. Wing nuts 41 are tightened on thescrews against the abutment bar, and'by loosening these nuts the screws 44may be swung on their pivot-axes to entirely disconnect the abutment bar from the foot portion of the standard. Y l

The abutment bar rotatably carries a threaded shaft, 49 which is held against endwisemovement and against rotation by a clamp plate 50 screwed to the abutment bar and clamping against a shoulder on the shaft 49 as shown in *Fig; 4. Screw threads 5| on the shaft 49 extend through a rotatable nut 52 which is 'held against endwise movement in the end wall 3!. The nut 52 is se- 7 cured to a ratchet wheel 53 which is-stepped along by a ratchet pawl 54 controlled'by solenoid 55. The solenoid is energized at the start of-a truing cycle in order to move the ratchet pawl 54 and thus turn the nut52 a portion of a revolution so as to'increase thedistance between the end wall and the abutment bar, causing a feeding movement of the entire carrier; The amount of this feeding movement corresponds to the desired amount of removal of the materialin V a truing cycle.

creases.

As the wheel is reduced insize, the space between the end Wall and the abutment bar in When it becomes necessary to replace the grinding wheel with a new one of larger diameter, the carrier is moved back toits initial positioning with respect to the abutment bar by.

loosening the clamp screws which hold plate 50 in place and then turning the squareend 56 of shaft '49 to rotate the shaft in the proper direction, the ratchet pawl 54 and a supplementary holding ratchet pawl 5'! serving to hold the nut on the work. By rotatably adjusting the housing I V portion of the carrier, this plane in'which the V diamonds move can be inclined to compensate for any required thread form. As will be apparent, the plane in which the diamonds move 'canbe horizontal or substantially horizontal even tween the end wall andthe abutment bar, are; arranged in telescoping casing tubes 59 and 60.

52 against turning with the shaft 49 in this readjustment of the carrier. 7

The endwall of the, carrier and the abutment bar are interconnected in ayielding manner-so that the carrier is constantly urged towards the grinding wheel under a desired spring'pressure,

resulting in the elimination of lost motion. The springs shown at 58, which are'interpose'd bewhich are secured respectively to the abutment The end wall '3! of the carrier these. holders.

. z swieoa bar'andto the-end wall as showwin Fig? 3; The

springs arel'ield under" compression, exerting rier andwithout -disturbing or-relieving the 'spring I motor 29' is arranged in" a compartment pwviddbetween the end wall 31 andatwe-b' -or' wall portion 650 of the carrierg' anddrives a gear train througha sp'eed redixctiorr gear box fi l. The gear 'trairr comprises eears fiz; 6'3; w; 65; 65 and 61; the latter being secured to a --to'othed cl ut'ch l wheel ti forming: the driving 1. element. of: a1 one revelation clutch including an drivenl plate: as.- wh'ichzis hired: to a shaft 'lwjoumaled in bracket HI on thecarrier. The plate: sacarries a drive. arm 12-: pivotally supported on thedrivexplate at 13:- Thedrivearmhas alprojection 1.4:? engageable with the teeth of; wheel 6'83 and: normally heldLiinengagementMith:thoserteeth by a spring. 15: pinned-:toi the driven lplatei 69; 0.11;. the. drive arm I 2.; is; as. finger; I 6 which; COmeSi up; against a. stop 'lII ,laftera one revolutionzof the driven"; plate 69 and pulls the .arm;12outofzengagementzwith. the toothed wheel. The stop ::11-.is;operated.by a solenoidipromptlmaf ter'a l-truinglcyclel is initiated sosthat the: StDpIiS'i pulled= out; of the; path of: the! projectionaw; thushfreeingthe arm" 72 so that. it canmove: intoengagement. with the rotating, clutchawheelfill andlproduce: one revolution of shafti'llt.

Pinnedltozthe shaft .10 is a double-plate; cam. I9. engaging rollerstu. arranged ona slide.- plate 812 The I slide plate.- 81- is provided .withv slots: 82 and =is:-.g uided for. horizontal movement on astud 83-land on the shaft"; the: double plate camlserving; to/positively. control: the reei-procatory movement. of.- tliisplatew 8.1 Plate 8-1 I has a slot: 85 engaged by and operating the end of a: leverflfi: whichds. pivotallv. supported onashaft-Bl. Lever 86 has an.arm-88 which ispivotally connected at 89- to. a bell .crank lever having armsQfl-and 9t pivotally, supported. at.92 on, a. pi-nwhich is ar. rangedinamount 94.. The forwardwall 0t the mount 94- is connected by. a flexible bBH-QWS193; to the. carrier; 24-assh0wn in Figs. 2 and. 3, andflis: provided. with an: opening admitting; the for.- wardly extending: portions of the holders 21 and zalandlpermitting adequate lateral/movement of The bellows 93. serves to retain the lubricant that may be suppliedto the operatingv partsinside the carrier This mount M hasbearing rods 95. and 95 see Eigs. 2, 3 and 6, extendingparallel to the aXis. of. the. carrier. and slidab'ly carried. in. guide holes provided in the. flangedi portions 96 at. the forward. end of. the carrier and inwebs 96 on thecarrier. Springs 48'. arranged. on rods 95' betweenthe flanges 95. and'tlie mount 94 yi'eldihglyiurge the. mount" to a retracted position. The..mount 9411s thus. bodily movablev in a. direction towards and from. the grinding. wheel, forward movements taking place from the position shown in Fig. 8' as theeplate 813 is moved downwardly as viewed in thatfi'gure, thus" causing counter-clockwise: rotation of lever arms 86" and' 88 through: an. angular travel of 30' degrees as shown. In tlie retracted. positionoi' them'ountwimhearms KEiandTBUiboth bear a 30': degree'reiationship to a line through the pin timed operation" of the 92 ari'd the-shaft '81; and. constitute a toggleioon ne'etioni the arms 885' and W moV-ingdnto aligIi' di positions" to advance the mount towards-s the T ,to -the mount in the.:car rier thus have grinding wheel; This advancing movement or;

the mount-produces the forward component-oi motionrequired of the diamondss The-horizontal component ot-motion of the diamonds is obtained; by sliding the diamond holders away from: one: another-on the mount at the same time the mount; is moved: towardethe grindin wheel; the movement of the mountna lso"produoina'this separateing movement of the diamond-I holders through: atoggleconneotiona. Eorr't'his purpose theaarmz 9 t is pivotally connectediby pivot pin-.fifi'to a link-1 Sl'l which'is pivotallwconnected'at982ththe holderr 28-=on1 which. the diamondi 25; is; carried-L. holder? Zitissslidably: supported at its afbrward end. at -spa'cedi portions on carryingl bar 35E andiatjt's2 reair' end: on: a rear bar: 99 which .is;fixed im then lm'ount 9 h The: holder" thus? moves with: the: mountain.azdirectionttowards andifrom thecgrind; ing: wheel. As the mount: 94 moves towardssthe: grinding. wheel, the" pin: 9.22: and; the pivot: pin: 984' both? advance; but; asxthey dorsmtiie arm. 91-: will: be? swung: through: 30': degrees to; straighten; the: arm' 91: into alignm'enti Withthe: linkrQJ'j. giving; a toggle effect in moving: thea diamond. mount; laterally: 'so' that. the lateral component of; motion; is: in; proper proportion to the. advancing? com ponent; of: the mountto'give the:desiredi 30 deegree: angle: of travelto thegdiam-ondsastrequ for truing a; grindingqwheel' designed; ta cut160;dearea-threads on th:WOI'kpi96e':.

The other diamond'holder 21: isslidably car-- ried on.th'e-1owerbar 3.5 with=thewrearportion.- offth'e1holder 21 slidableon=the;rear:bar 99. 0n this holder Zlis a pin' 98: which is connectedibyla-. togglelinkage-Ql', 91, see.1iig;.9; similar twthelinks-9| and'B'I, to the armeihso. that-movements- 9 of the toggle link- 9]! in a. clockwise direction through 30 degrees willstraighten the. toggle cone neotion.v between the pins. 92. and 984 and move the holder 21 ina manner similar butopposite; to that of the holder: 28.. Thermotionsz-imparted the effect. of movingrthediamonds aseindieatedinFigs: 9- and 10; the doubleplatqeam whichoperatesplate' 8| being. soarrangedthat after the. start: of a.

cycle of lrotationof plate 69-ofthe one revolution clutch, thediamondfii will move from. the point 0 to. the point d while the. diamond 2!: moves from. the pointc' to the pointhmr Duringgrindingof the. work, however, the diamonds areboth re-- tracted. back fromthe; grindingwheel and. at. the; start of a truing cyclethey areadvancedintothe positionmc partially bythe feeding; movement. of thewhole carrier. produced byoperationzof. the

solenoid operated ratchet pawl. which moves.

the diamondsfrompoints.a,.af topoints. b, b1 as; shown inFig, l0, and partlyby amotionim- .partedto the. mount. 9,4 toadvance-the diamonds. from points 6,1) to. points-c, c This motionb' to cis produced, as herein shown, by, movingthe. pivotalsupport of the lever 86.--88l towards. the. grinding: wheel. by aneccentric motion. of. a portion ofithe shaft. 8.1; This eccentric motiontakes. place before the arm 85- ismoved. by plate. Bl. Theshaft 8'1. hasa slottedarm lfl'fllwhichis con: trolled by a bell-cranklever. I0] pivoted at H121 andlhaving a pin. I01 whichoperates. intlie slot. inarm IUD The slot is sofdrmedithat. as the. bell-crank lever moves clocliwisethe. arm Hm'is. turned counter-01o ckwise l to advancethe .pivot'all support of the 1ever8'6"-8BT towards the. grinding;

wheel without producing any substantialrotation of the lever. .The second arm I04 of the bellcrank lever IIlIis operated by a cam I05 pinned to shaft II! and so timed as to cause the eccentric.

adjustment of the shaft 81 promptly after initiating one revolution of the shaft I and before the plate BI is operated by its double plate cam to swing'the arm 86. The diamonds are, thus advanced from b, b, to c, 0', see Fig. 10, andthen turning movement of the arm 86 brings the toggle connections into effect to cause the diamonds to travel in diverging directions at the proper angle. This moves the diamond 25'from c to d.

The cam I then permits counter-clockwise return movement of the bell-crank lever I0! to again turn the eccentric shaft 81 back to its ini- 1 tial position, thus causing the diamond 25 to move 1 from the point (2 to point e so as to'be clear of the grinding wheel. controls plate 8! then moves back to its initial The double plate cam which position, operating the toggle connections between nections between the mount and the diamond holders so that the diamond 25 moves from point 7 e to point b. The one revolution clutch then completes its cycle without further movement of the diamonds taking place. At thestart of the next cycle, by closing the solenoid 55, a second feed movement takes place to move the carrier bodily so that the diamond is advanced from b to I. When the solenoid 55 is energized to cause the feeding movement of the carrier, the same circuit completes a circuit which starts the motor 29 and completes a circuit through the solenoid which operates to retract the stopping pin I1 of the one'revolution clutch. The operationof the 7. motor 29 thus advances the diamonds from i to h,

the distance between 0 and h representing the amount that is removed from the grinding wheel in'thef preceding truing operation. The advance or feeding movement of the carrier has been exaggerated in Fig. 10 since only a few ten-thoucarrier, and without requiring any adjustment in or loss of tension of the springs 58, since the abutment bar comes 01f with the carrier as a unit.

the shaft 8'! andthe mount and the toggle consandths of an inch movement is actually required for this purpose in each truing cycle.

'Each diamond is arranged as shown in Fig. 4 in a diamond setting It? having a hole I68 in which a locating dowel I 09 on the'holder 21 or 28 projects. The setting for the diamond 25, for example, has a boss III: which extends into a passage in the diamond holder' 2'I,the boss II 3 1 being internally threaded-so that the diamond setting can be heldsecurely by'tightening the screw III having a hexagonal or slotted end so that itcan be turned'by rotating a tool extending approximately tangentially of the grinding wheel. The two screws III-for holding the two diamond settings extend parallel to one another,

one being arranged to be accessible from above 7 the one from below the holders 2! and 28, so that the diamond settings can be readily removed in a direction perpendicular to a horizontal plane through the grinding Wheel axis, or in other words,

substantially tangentially with respect to the grinding wheel periphery. This permits removal of the diamond settings from the carrier itself,

since the removing tools by which the diamond In effecting a desired inclination of the grinding wheel itself, by turning the grinding wheel.

sup-port I2 on its axis in order to accommodate a desired helix angle, no change need be made in the plane in which the truing diamonds operate, and this plane may be maintained horizontal. This is desirable especially where the helix angle is not large, but where some compensation is re quired, especially in the case of large helix angles,

the housing portion of the carrier can easily-be constitutes a preferred embodiment of the invention, it is to be understood that the invention .is

not limited to this precise form of apparatus, and

that changes may be made therein without departing from the scope of the isdefined in the appended claims.

What is claimed is:

1. In a grinding apparatus, incombination, a 4

frame, a grinding wheel support'on said frame having a passage extending transversely of the grinding wheel axis, a carrier in said passage having a portion adapted for axial and rotational movement in said passage and a second portion adjustably connected to the first portion and arranged for axial movement only, said frame, anti-friction means supporting said second portion on said standard for movement thereon, adjusting means for moving the carrier with respect to the standard, wheel truing mechanism in said carrier, and driving means for said mechanism.

2. In a grinding apparatus,in combination, a frame, a grinding wheel support on saidframe having a passage extending transversely of' the grinding wheel axis, a carrier in said passage hav ing a portion adapted for axial and rotational movement in said passage, wheel truing mecha-' nism in said carrier, driving means for said mechanism, a standard fixed on said frame having a separable abutment member, spring means between said abutment member and said carrier, and screw thread adjusting means for moving the carrier'with respect to the standard.

3. In a grinding apparatus, in combination, a frame, a grinding wheel support on said frame having a passage extending transversely-of the grindingwheel axis, a carrier in said passage hav-- ing a portion adapted for sliding movement in both axial and rotational directions in said wheel settings can be loosened can be applied without j extending from the grinding wheel axis or through the plane ever,if it becomes necessary to repair, replace, or inspect any of the parts contained in the carof the grinding wheel. Howrier the entire carrier can be readily removed from the grinding' wheel Support, and this is effected, as 7 already mentioned, without disturbing the setting between the abutment, bar and the support, wheel truing mechanism operably mount- 7 ed in said carrier, driving means for said mechanism, a motor for operating'said driving means, a standard fixed on said frame, and adjusting means for axially feeding the carrierwith respect to the standard.

4. In a grinding apparatus, in combination, a

frame, a grinding wheel support on said frame having a passage extending transversely of the grinding wheelaxis, a carrier adjustably'mounted axial movement therein, wheel in said passage for invention. which 1 a standard on ,said passageand'havingsan abutmentportion deltachablyconnectedto the jfootportionand norjmallysextending across .one .end .of said carrier, spring. means betweensaid. carrier, and saidlabutmerit portion, and means .for. moving the carrier withrespectto said abutmentportion.

J 5. In. a grinding apparatus, in combination, va .rframe agrinding wheel supporton said ,frame having apassage extendingtransversely ,df the ,grinding wheel, axis, a .carrierin saidpassa e'hav- ,ing .a ,portion adapted for axial and rotational ,movementinsaid passage, .Wheel ,truing mecha- .,nism1in said carrier,.driving meansiorsaiid mechanism, a .standard -;.on. said frame, saidstanjdard having a .foot, portionpast which .the carrier can be moved. from said passage an d.having, aneabut merit ,portion detachab 1y ,connected ,to the "foot ,portion and normally extending .across .nne end of said ,carrier, spring means. between saidecarrier and ,saidahutment .p ortion,. a threadedjntercom ,.nection between said. abutment ,.portion..and said carrier, ,andmeans for operating thethreaded interconnection. to moverthe carrier .withrespectio .thestandard.

16. .In .a grindingapparatus, in combination, .a

grinding wheel. support having ,a, passage extendling transversely. of the,grindin g wheel axis, .a car- ,rienin said passagehavinga portion. adapted-for eaxial. movement therein, wheeltruing mechanism vin.,sa,id ,carr-ier, driving means for, said ,mecha- ,-a,' fixed standard, ,said standard having .a

jfoot portion past whichthecarrier can be. moved .from. said vpassage. and having anrabutment por- ,tion., detachab1y connected to the. foot. portion and normally extendingacross 0ne ,end ,of saidecarrier, .spring. means .between said carrieraand said abutment ,portion, a threaded interconnection between said sabutment portion .and said ,carrier, adjusting, me ans for operating. .said threaded in- -.terconnecti 0n, ,said carrier together with ,said

abutmentportionibeing removable as aunit, from .said support without disturbing ,the itension .of thesspring ,means, when the. abutment portionis detached from thefoot portion.

".7. ,ln. agrinding apparatus, in combination, a

frame, .a grinding wheel support rotatably eadiustable on. said. frameand' havinga passage .extendingetransverselyof the, grinding Wheel axis a carrier in, said, passage having .a portion adapted ,for .radial and rotational movement .therein,

wheel .truing ,mechanismein, said carrier driving i meansjfor. saidrmechanism, a standard ffixe'd on .saidiframe, ,said standard having a jfoot portion "past Whicht'the carrier can'bemovedffrom said ,passage and; havin an. abutmentportion detachably connected totheQfoot portionand normally extendin across one vend of said carrier, spring -means between ,said carrier and .said abutment portion, .an adjustable iinterconnection between said abutment portion, and said carriensaid car- .rier ltogether .with ,said abutment portion being removable as a unit without disturbing the ten- .sion .of the spring means, when the .abutment portionis detached from'the jfoot..portion, and means,'for adjusting saidadl'ustable' interconnec- ;tion to jfeedrthacarrier' bodily towardsthe grindl ing wheeL axis.

11 a grinding apparatus, in combination, "a rrameia grinding,wheelsunnor havmaapa sa ,extendinatransversely, off t ey grindin wheelaxis,

a carrier in said passage having a" housing 'por- -Wheel truing mechanism insa-id carrier,- a

"9. "Ina-grindingapparatus, in combination, a

fframe, agrinding Wheelsupport rotatably adjustable" on said frame and having a passage extending transverselyoi'the grinding wheelaxis, a carrier} in saidpassage having a cylindrical portion rotatably and =axially =mova-ble in said support and having an end wall*rotatably'adjustable with respect i to "the -;cylindrical portion, wheel truing mechanism operably mounted said carrier, driving means "jfOI said mechanism, a standard carried by 'said frame, adjustingmeans between "said-end Wall andsa-idstandard; said standard and end wall having --c0operating portions preventing rotational movements of said end wall and supporting the carrier for -axia1- movement's in saidpassage.

' 1 0. In-a'grindingapparatus, in combination, a frame, a-grinding "wheel {support-on said {frame having a passage extending transversely of the grinding wheel axis, a carrier in said passage having a housing portion one -end 6f vvhicl'ris adapted "for 'axial and rotational movement in said passage, an enchwall forsaid carrier,- means "tional-movement of the "-end"wal1, said standard having an abutment portion, and means for adjusting the'erid wall withrespect to the abutment portion.

=11. In a grinding apparatus, in combination, a "frame, -=a I grinding wheel -support on said frame i having "a passage extending transversely or 'the grinding wheel axis, a carrier in saidpassage, motor in said carrier "for operating said mechanism, means for axially adjusting the carrier withrespect to the grindiI-1g 4 wheel support, oneend of said *carrier 2 having a sliding fit in said passage "and '"the otherend having "a rolling support on the-frame at opposite sides o'fthe carrier axis at locations-radially outwardly of the confines of -the passage. v

12. In-a grinding apparatusfin combination, a frame, a grinding wheel support rotatably ad- "justable on the frame and" having a passagecextendingtr-ansversely of "the grinding wheelaxis,

port is -rota'tably adjusted, *and means -providing for rotatable adjustmentpf carrier about the axis 'ofsaid passage.

1-3. In a grinding apparatus; in combination, a

frame, -'a "grinding Wheel-support on 'saidframe,

a carrier on said support, means for adjusting the carrier with respect to the grinding wheel sup port,wh'eel truingmechanism in said carrier and includinga pair of wheel trimmer holders, a common mount having h'oider guides slidably supporting said holders for rectilinear movement parallel toithe axis of the grinding wheel inopposite directions, a pair of toggle links interconnecting said mount and one of said holders, a second. pair of toggle links interconnecting said mount and the other holder, a positive interconnection between the two pairs of toggle links, and 7 means for moving said mount in said carrier in a direction perpendicular to the grinding wheel axis and at the same time moving said toggle links to move the holders on said mount. i

'14. ha grinding apparatus, in combination, a frame, a grinding whee1 support on said frame having a passage extending transversely of the grinding wheel axis, a carrier in said passage,

means for adjustingthecarrier with respect to the grinding wheel support, wheel truing mechanism in said carrier and including a pair of wheel trimmer; holders, a common mount slidably carried for rectilinear movement in said carrier and having holder guides slidably supportin said holders for rectilinear movement thereon substantially parallel to the grinding whee1 axis in,

opposite directions, means for moving said mount bodily in a direction perpendicular to the grinding wheel axis, and a pair of links interconnecting each of said holders to said mount and arranged to move into alignment to cause relative separation of said holders on said mount.

15. In a grinding apparatus having a grinding wheel support, a truing mechanism for the grinding wheel comprising a carrier mounted in said support for movement perpendicular to the grind- 7 ing wheelaxis, a pair of wheel trimmer holders,

a mount slidably supporting said holders for rectilinear movement in opposite directionsen said mount, means supporting said mount on said carrier for rectilinear movement in a direction perpendicular to the grinding wheel axis, toggle means for operating said mount towards and from the grindingwheel axis and toggle means for, op-

erating said holders in opposite directions on said mount.

16. In a grinding apparatus having a grinding wh'eel support; a carrier in said support, a pair of wheel trimmer holders, a mount slidably supporting said holders for rectilinear movement in the same plane in opposite directions on said mount, means supporting said mount on said carrier for rectilinear sliding movement in a direction perpendicularto the grinding wheel axis,

toggle links adapted for operationv thrusubstantially 30 degrees travel to operate said mount,

and means operated by said toggle links for operating said holders in opposite directions on said mount.

17. Wheel truing mechanism comprising a carrier, a pair of. wheel trimmer holders, a mount slidably supporting said holders for rectilinear movement thereon in opposite directions, guide means for said mount and providing for sliding movement of said mount on said carrier, toggle links for operating said mount on said guide means, a-set of toggle links for operating each "of" said holders on said mount, and means for 1 operating said toggle links.

18. Wheel truing mechanism comprising a carrier, a pair of wheel trimmer holders, 2. mount slidably supporting said holders for rectilinear movement thereon in opposite directions, guide means for said mount and providing for sliding movement of said mount'on said carrier, toggle links for operating said mount on said guide means, a set of toggle links for operating each of said holders on said mount, and additional means for advancing and retracting said mount to move said holders toward the wheel at the start of a truing operation and retract the holders from the wheel at the end of a truing operation.

19. Wheel truing mechanism comprising a carrier, a pair of wheel trimmer holders, a mount slidably supporting said holders for rectilinear movement thereon in opposite directions general ly parallel to the wheel axis, guide means for said mount and providing for sliding movement of said mount on said carrier towards and from the wheel, a toggle linkage for operating said mount on said guide means, means for moving the holders on the mount during movement of the mount, and additional means for advancing and retracting said mount to move said holders towardsthe wheel and retract the holders from .thewheelat the beginning and end of a truing operation.

20. Wheel truing mechanism comprising a car- 7 rier, apair of wheel trimmer holders, a mount slidably supporting said holders for rectilinear movement thereon in opposite directionsgenerally parallel to the wheel axis, guide means for said mount and providing for sliding movement of said mount on said carrier towards and from the wheel, a toggle linkage for operating said mount on said guide means, means for moving the holders on the mount. during movement of r the mount, and additional means for advancing and retracting said mount to move said holders towards the wheel and retract the holders from the wheel at the beginning and endof a truing operation, and means for moving the carrier for feeding movement of the holders.

21. Wheel truing mechanism comprising a carrier, a, pair of wheel trimmer holders, a mount slidably supporting said holders for. rectilinear movement thereon in oppositedirections general- 1;; parallel to the wheel axis, guide means for said mount and providing for sliding movement of said mount on said carrier towards and from the wheel, a set of toggle links adapted for rotational movement through 30 degrees travel from one limiting position in which the arms are angularly related into another'limiting position in which the arms are substantially in alignment, for moving said mount towards and from the wheel, a set of toggle linkages connecting said mount to each of said holders and adapted to move through 30 degrees travel from one limiting position in which the links are angularly related into another limiting position in which the links are substantially in alignment, and additional means for moving said first set of toggle links to advance the mount towards the wh'eel.

22. Wheel truing mechanism comprisin a carrier, a pair of wheel trimmer holders, a mount 7 23. In a grinding apparatus, in combination, a frame, a grinding wheel support on said frame, a carrier on said support, wheel truing mechanism in said carrier and including a pair of wheel trimmer holders, 9, common mount having holder guides slidably supporting said holders for rectilinear movement substantially parallel to the axis of the grinding wheel in opposite directions,

a lever pivoted on said mount, means connecting said lever to said holders to move the holders on said mount when the lever is turned, and means for simultaneously turning said lever and forcing said lever bodily in a direction towards the grinding wheel to bodily move the mount in the carrier while the holders move on the mount.

KONRAD RAUCH. 

